DE2317882A1 - ADJUSTABLE STOP FOR BENDING PRESSES - Google Patents

Description

April 9, 1973 P 4639 - relu

Ice cream. A. Colly S.A., Constructions hydromecaniques

Yilleurbanne (Pranfcneich)

Adjustable stop for bending presses

The present invention relates to a stop for press brakes, the vertical section of which has an angular shape, i.e. has two reference surfaces, one by its front edge and the other by the front surface of its rear approach is formed.

- 2 309342/0190

This type of stop has the "advantage of having a section." of small thickness, which is used in the vicinity of the effective range of the slide and a section that lies behind a support area. The first paragraph is thus formed by the front edge of the stop and the second by the front vertical Area of its base or vertical arm

If one changes from the use of one reference surface to the use of the other, it is therefore necessary to that one moves the stop in a vertical direction from bottom to top or from top to bottom.

In the case of the known type of attacks, this movement is controlled by a manually operated lead screw or by controlled by a motor and the size of the adjustment movement is at the discretion of the operating personnel,

The aim of the present invention is the possibility to create the stop quickly and fragrantly in to adjust the vertical direction, ge according to the requirements of the application. Another goal of the

- 3 -309842/0990

_ 3 -

The invention is also to enable complete programming of such movements.

For this purpose, the attack according to the invention is sound carried by an organ that determined on its support in the vertical direction between at least two Positions of different heights is movable, one of which is the use of the first reference surface and, another corresponds to that of the second reference surface, means being provided for this stop to transfer from one position to the other

When the previously bent front edge of a metal sheet is placed against the front part of the stop should, the stop is preferably moved vertically downwards or upwards, depending on whether the aforementioned edge is curved downwards or upwards. The aim of this arrangement is to avoid that the rounded zone of the sheet is used to determine its position with respect to the stop. Under these circumstances it is advantageous that the stop can be set to three different heights can, i.e. in two outer and one middle positions.

309842/0990

According to a special execution form of the object According to the invention, in this case the organ carrying the stop is arranged so that it is in the vertical direction can slide on its own pad and with the body of a pneumatic or hydraulic cylinder is connected, which has two pistons, one of which is up and free and the other is at the bottom, has a larger stroke than the upper piston and, thanks to its piston rod, is at the aforementioned support is attached, these two pistons in the cylinder body three separate and independent from each other limit the fed chambers, while the cylinder body has a projection at the level of the middle chamber, which serves as a stop for the piston.

So it is possible that you can see the cylinder body and consequently the support of the attack in three different positions can be taken, namely a lower, a middle, and an upper, by opening the lower chamber or the two outer chambers or the middle chamber is supplied with a pressure medium (with compressed air), while the other chambers are then connected to the outlet.

According to a further particular embodiment of the subject matter of the invention, the organ carrying the stop is

- 5 - 309842/0990

so arranged that it is perpendicular to its own support can slide and this' support carries the body of two independent supply cylinders of different stroke size, .whose movable Piston rods can give the organ carrying the stop a push in a vertical direction to move, while return springs are provided to the aforementioned organ at all times against the farthest to push advanced piston rod.

The stroke of one cylinder is equal to the distance between the two outer positions of the stop and the stroke of the other cylinder is equal to the distance between an outer position and the middle one Position. It is therefore possible to let the stop take three different positions, by supplying one or the other cylinder or none of the two cylinders with pressure medium.

In the drawing, two exemplary embodiments of the subject matter of the invention are shown. Show it:

Fig. 1 to 3 the stop according to the invention in its three possible positions, namely in its lower, middle and upper

- 6 - ' 309842/0990

Position, each in a schematic

Depiction,

Fig. 4- "to 6 a first embodiment of the stop according to the invention in its three positions according to FIGS. 1 to 3" each ^ ³¹ a section,

7 shows a second embodiment of the invention Stop in a front view partially in section and

8 shows the stop according to FIG. 3. 7 · i ^ a cut.

As shown in Figs. 1 to 3, it is depending on what you use the front edge 2a of the stop 2, ent neither to apply the downwardly bent end or the straight end or the upwardly bent end of a metal sheet to him , indispensable that you can move the stop 2 in a vertical direction from bottom to top land umgekebrb.

In the embodiment shown in FIG. 1, the stop 2 assumes a middle or intermediate position, in the embodiment shown in Fig. 2 takes

- 7 -309842/0930

the stop a lower position and finally takes the stop in the Ausführungsbelspiel shown in FIG an upper position.

Figures 4 to 6 of the drawings show the application of the invention in an ABchlag 2, which is arranged on a carriage 4, which is generally used in bending presses is used and is movable along a horizontally extending bar 5.

The stop 2 is carried by an organ 6 which is movable in a vertical direction on the slide 4, which serves as a support. For this purpose, the organ 6 has the shape of a fork, the lower horizontal arm of which bears two vertical columns 7 which can slide in bearings 8 firmly connected to the slide 4. The upper arm of the organ 6 is controlled by the piston rod 9a of a pneumatic one Cylinder 9 penetrate, the body 9b of which is attached to the top of the upper arm of the organ 6 "

The body 9b of the cylinder 9 comprises, in addition to the lower, with the piston rod 9 * firmly connected piston 11 an obesen free piston 12, whose movement in the direction of the Piston 11 is limited by an inner shoulder 13,

309842/0990

which is provided for this purpose in the bore of the body. The stroke of the piston 11 is greater than that Stroke of the piston 12.

The pistons 11 and 12 limit the interior of the body 9t> of the cylinder 9 three mutually closed chambers, namely an upper chamber 14, a middle one Chamber 15 and a lower chamber 16 which are independent of each other be fed with compressed air.

The one in Pig. 2 and 4 shown lower position of the stop 2 is achieved by feeding the lower chamber 16 with compressed air and the other two chambers 14 and 15 connects to the air outlet.

In this case, the pressure generated in the lower chamber 16 tends to move the body 9 ″ b of the cylinder 9 in the To move in the direction of arrow 17, i.e. to move stop 2 downwards. The path of the body 9 "b of the cylinder 9 i »· Direction of arrow 17 is due to the resting of the projection 13 on the lower piston 11 is limited.

The middle position shown in Figs. 1 and 5 of the Stop 2, i.e. the body 9b of the cylinder 9 achieved by the upper chamber 14 and the

309842/0990 " ⁹ "

lower chamber 16 of this cylinder simultaneously with compressed air, while the middle chamber 15 with is connected to the outlet. If you want to reach this position from the ο Den "described lower position, so it is easily understood that by creating a pressure in the chamber 14, the body 9b of the cylinder 9 is moved in the direction of arrow 18, due to the fact that the cross-section of this chamber, which is not reduced by the presence of a piston, is larger than that of the chamber 16 which in turn by the presence of the piston rod 9a of the Piston 11 is reduced. The movement of the body 9b in the direction of arrow 18 w ± r & limited by the contact of the projection 13 on the underside of the piston 12. The piston rod 12a of this piston 12 is now actually pressed against the top of the piston 11 by the pressure that prevails in the chamber 14

To finally the body 9b of the cylinder 9 and thus the stop 2 from the middle position shown in FIGS. 1 and 5 into the position shown in FIGS. 3 and 6 shown To transfer the upper position, it is sufficient to interrupt the supply of compressed air to the chambers 14 and 16 and only to feed the middle chamber 15 with compressed air. In this case the piston will. 12 returned

- 10 309842/0990

- ίο -

pushed until it touches the top bottom or lid of the body 9b of the cylinder 9, then it passes through his Move the body 9b with it until it passes through the protrusion 19 formed stop, which is provided in the middle of its lower bottom 21, with the underside of the piston 11 is in contact.

7 and 8 of the drawings show the application of the Invention on a second stop 2. This stop is also on a horizontally extending one Bar 5 movable carriage 4 is arranged and is from one on the carriage 4 in a vertical sighting movable organ 6 carried.

This second embodiment differs from that first embodiment through the design of the device, which makes it possible to take three different positions, namely a lower, middle and upper position. The carriage 4 carries here on its upper part the bodies 22 and 23 of two pneumatic or hydraulic ones Cylinders arranged side by side. Each of these cylinders has a movable one Piston rod 24 and 25, which can be evaluated in the vertical direction. The supply or The feeding of the two linders takes place independently of one another and their movements are different.

309842/0990 - 11 -

With respect to the piston rods 24 and 25 more perpendicular Direction contains the organ carrying the stop 2 6 bearings or recesses 26, on the basis of which these Piston rods "can exert an impact on the organ 6.

Under the organ 6, substantially perpendicular to the piston rods 24 and 25 and the bearings 26 are two groups of springs 27 and 28 arranged in every moment 'the member 6 against the most advanced movable piston rod, i.e. the lowest Press the piston rod.

The movement path of one cylinder is equal to the distance between the two extreme positions of the Stop and the path of movement of the other cylinder is equal to the distance between the upper and the middle position of this stop

When the two piston rods 24 and 25 are up, the member 6 and thus the stop 2 are in the upper position. The two piston rods then press on the member 6 at the bottom of the bearings \ m. Recesses 26

Depending on whether one feeds one or the other cylinder, the organ 6 moves from its upper position

- 12 309842/0990

down to its middle or to its lower position.

To move from the lower position to the middle position to come, move the piston rod with the smallest stroke down, then move the piston rod with it the largest stroke all the way up. The piston rod, which has just been moved down, serves the organ 6 as a stop and holds it during its upward movement in the middle position.

To get from the middle position to the lower position, move the piston rod with the largest one Stroke completely down, then you move the piston rod with the smallest stroke up. The piston rod, which moves downwards, takes the organ 6 downwards with it after it has covered a path that is the same the 7i / eg of the other piston rod is.

From this arrangement it follows that in one or the other embodiment described, the regulation of the Stop position instantaneous and programmed, i.e. can be made in a targeted manner. It is thus possible with press brakes that are equipped with this device are to provide a numerical control.

- 13 309842/0990

Claims (3)

Expectations 1.) Adjustable stop for press brakes, which is in one perpendicular section has an angular shape, i.e. has two reference surfaces, one of which is defined by its front edge and the other is formed by the anterior surface of its posterior attachment, characterized in that it is formed by an organ (6) is worn, which is different on its support in the vertical direction between two specific positions Height is movable, one of which the use of the first reference surface and the other of those of the second Reference surface corresponds, with means being provided to this stop (2) from one position to the other convict. 2. Stop according to claim 1, characterized in that the organ (6) carrying the stop (2) is arranged so that it can slide in a vertical direction on its own support (its own support) and with the body (9b) a pneumatic or hydraulic cylinder (9) having two pistons, the upper one of which or front (12) is free and the other, the lower or rear (11), has a greater stroke than the front piston and is attached to the aforesaid support by its piston rod, these two pistons in the cylinder body (9b) being three separate and independent from one another limit fed chambers (14, 15, 16) while -H-309842/0990 the cylinder body at the level of the central chamber (15) has a projection (13) which serves as a stop for the piston. 3. Stop according to claim 1, characterized in that the organ (6) carrying the stop (2) is arranged so that it can slide in the vertical direction on its own support (4) (its own support) and that this support the body (22, 23) of two independent supply cylinders of different stroke sizes, whose Movable piston rods (24, 25) can give the organ carrying the stop a push in order to move it in a vertical direction to move, while resilient return means, e.g. return springs (27, 28) are provided to the aforementioned organ to press immediately against the most advanced piston rod. 309842/0990